Influence of air humidity on biological control, fertigation, yield and quality of cut roses in soilless culture | Influence de l'hygrometrie sur la lutte biologique, le rendement, la qualite et l'irrigation fertilisante en culture de roses hors sol
2007
Gilli, C. | Darbellay, C. | Farinet, R., Station de recherche Agroscope Changins-Waedenswil ACW, Conthey (Switzerland). Centre de Conthey
Horticultural Glasshouses are more and more often equipped with mist and fog systems. To appreciate the influence of air humidity on soilless culture of roses, the efficacy of biological control against mites (Tetranychus urticae) and white flies (Trialeurodes vaporariorum), the production of cut roses, their vase life and the emergence of diseases were analysed. In the treatment with regulation of air humidity, the development of mites during the hottest months in summer was limited compared to the treatment without fog system. On the other hand, the air humidity adjustment did not show significant effects on the development of the white flies, on the parasitism rate by Encarsia formosa, or on the yields. However, it allowed reducing the development of powdery mildew. The air humidity adjustment reduced the absorption of the nutrient solution, probably due to the lower transpiration rate and negatively influenced the vase life of the cut roses.
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